{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Chemical cross - linking combined with an enzymatic digestion and mass spectrometric analysis of the reaction products has evolved into an alternative strategy to structurally resolve protein complexes ."}
{"Chemical": []}